Earthquake with magnitude of Md 2.3 on date 26-03-1991 and time 00:53:05 (Italy) in region 5 km N Borbona (RI)

A magnitude Md 2.3 earthquake occured in region: 5 km N Borbona (RI), on

  • 25-03-1991 23:53:05 (UTC)
  • 26-03-1991 00:53:05 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.56, 13.14 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Borbona RI 5 617 617
Posta RI 5 694 1311
Cittareale RI 7 482 1793
Montereale AQ 10 2581 4374
Cagnano Amiterno AQ 13 1369 5743
Micigliano RI 14 127 5870
Capitignano AQ 14 665 6535
Leonessa RI 14 2435 8970
Amatrice RI 15 2657 11627
Antrodoco RI 16 2588 14215
Barete AQ 17 737 14952
Accumoli RI 18 667 15619
Borgo Velino RI 18 972 16591
Monteleone di Spoleto PG 19 599 17190
Pizzoli AQ 19 4326 21516
Campotosto AQ 19 542 22058

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NW of L'Aquila (69753 inhabitants)
40 Km E of Terni (111501 inhabitants)
48 Km W of Teramo (54892 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
71 Km NE of Guidonia Montecelio (88673 inhabitants)
72 Km NE of Tivoli (56533 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
86 Km E of Viterbo (67173 inhabitants)
86 Km SE of Perugia (166134 inhabitants)
88 Km W of Chieti (51815 inhabitants)
89 Km W of Pescara (121014 inhabitants)
92 Km NE of Roma (2864731 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.3
M 2.0
1991-03-25
23:53:05
42.56 13.14 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 138219
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-03-25 23:53:05 ± 0.118
Latitude 42.56 ± 0.01
Longitude 13.14 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 138219

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1135.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00251
Epicentral distance of station farthest from the epicenter (degree) 0.00882
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 138219
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:08:58

M:2

Field Value
Value 2
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 138219
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:32:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1991-03-25T23:53:39.12 10.0 undecidable manual SG 351 0.0085 0.75 0.1
--.CIO.Z. 1991-03-25T23:53:27.82 10.0 undecidable manual SG 0 0.0057 -0.44 0.4
--.ASS.Z. 1991-03-25T23:53:27.71 10.0 undecidable manual SG 324 0.0055 0.03 0.8
--.ARV.Z. 1991-03-25T23:53:25.47 10.0 undecidable manual PG 351 0.0085 0.8 0.3
--.SDI.Z. 1991-03-25T23:53:25.57 10.0 undecidable manual PG 149 0.0088 0.27 1.2
--.MNS.Z. 1991-03-25T23:53:19.83 10.0 undecidable manual SG 243 0.0034 -0.27 0.6
--.ALP.Z. 1991-03-25T23:53:19.91 10.0 undecidable manual SG 54 0.0034 -0.29 0.9
--.CIO.Z. 1991-03-25T23:53:18.40 10.0 undecidable manual PG 0 0.0057 -0.8 0.3
--.ASS.Z. 1991-03-25T23:53:18.48 10.0 undecidable manual PG 324 0.0055 -0.02 1.9
--.AQU.Z. 1991-03-25T23:53:16.79 10.0 undecidable manual SG 136 0.0025 -0.14 0.7
--.MNS.Z. 1991-03-25T23:53:14.00 10.0 undecidable manual PG 243 0.0034 -0.13 1.9
--.ALP.Z. 1991-03-25T23:53:14.26 10.0 undecidable manual PG 54 0.0034 0.08 1.9
--.AQU.Z. 1991-03-25T23:53:12.33 10.0 undecidable manual PG 136 0.0025 0.04 1.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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